DIN 5 2031-0 standard for light fastness testing of non-metallic parts in the passenger compartment, including Spinning & weaving products, plastic parts, rubber parts, etc. The standard defines a test method for exposure to sunlight under simulated natural light conditions using xenon arc to evaluate the colour fastness and light fastness of materials. Comparison of the test period and the standard sample is the key to the inspection to ensure the durability of non-metallic parts in actual use.